Mirror problem


Out of the blue, and without any impact to the housing, my passenger side mirror has become loose. The motor still works, but the glass itself jiggles when the car is moving. I pressed it in firmly and this stopped the jiggling for a few days, but now it's back. Does anyone know how to repair this problem? Will it require a whole new mirror assembly? It's just amazing to me how time ravages everything. This car is 8 years old, has 31,000 miles and is always garaged, and things still spontaneously break
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